JPS60247810A - Magnetic head - Google Patents

Abstract

PURPOSE:To surely hold a magnetic thin film and in addition, to stabilize the finish of a magnetic head in the manufacturing process of the magnetic head, by providing a wedge which press-contacts the magnetic thin film with the inner side face of a core inserting groove in the vicinity of the opening section of the core inserting groove. CONSTITUTION:An amorphous magnetic thin film 5 is inserted into the core inserting groove 8 of a firmly joined block body 13 and, after a wedge 9 is inserted into the groove with pressure, the magnetic thin film 5 is firmly stuck by means of a low-melting point glass rod 14. Then the joined block body 13 is cut at the gap forming position and the cut surfaces are polished. Then the block bodies 13 are again firmly joined to each other and gaps 6 are formed. Thereafter, the block body 13 is sliced along A-A' lines and magnetic heads are manufactured. Polishing operations are performed under a condition where the upper end section of the magnetic thin film 5 is press-contacted with the inner side face of the core inserting groove. Therefore, vibrations received by the upper end section 5 during the course of the polishing operation are reduced and the magnetic head can be finished excellently.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a magnetic head used in a VTR or the like, and particularly to a magnetic head for high-density recording.

[Background of the invention]

Conventionally, single-crystal ferrite materials have been used for the magnetic cores of magnetic heads such as video heads for VTRs because of their excellent wear resistance and ease of controlling crystal orientation. However, in recent years, as magnetic recording media have improved and high magnetic flux tapes capable of high-density recording have appeared, conventional magnetic heads that used single-crystal ferrite material for the magnetic core can no longer cope with the low magnetic flux density.
There has been a demand for a magnetic head for high-density recording in which a magnetic bump is made of a magnetic metal material with a high magnetic flux density. In particular, the 7morphous magnetic material has excellent magnetic properties and wear resistance,
It is attracting attention as a magnetic material with excellent corrosion resistance and chemical resistance.

[Prior art and problems]

FIG. 3 is a cross-sectional view of a conventional magnetic head in the process of being manufactured using an amorphous magnetic material for a magnetic bump. In the figure, an amorphous magnetic thin plate 1 is fixed to a knob holder 4 by glass 3 filled in a core insertion groove 2.
Thereafter, it is polished into a predetermined shape shown by a two-dot chain line using a polishing tape or the like.

By the way, in the glass 3, the magnetic thin plate 1 is inserted into the knob insertion groove 2.
It is obtained by inserting a glass rod or the like into the glass rod, heating it, melting it, filling it, and cooling it, but since the volume of the glass contracts during this cooling, there is a gap between the magnetic thin plate 1 and the glass 3. occurs, and the adhesion between the two is not necessarily good. Therefore, when performing the above-mentioned polishing, the magnetic thin plate 1 is shaken, and as a result, the adhesion with the glass 3 is further deteriorated, and the holding of the magnetic thin plate 1 becomes uncertain. There was a drawback that the finish of the upper end surface of the thin plate 1 was uneven for each product. [Objective of the Invention] An object of the present invention is to solve the above-mentioned drawbacks of the prior art, and to improve the retention of the magnetic thin plate with ease. The objective is to provide a magnetic head with a stable finish.

[Summary of the invention]

In order to achieve this object, the present invention is characterized in that a wedge is provided which is press-fitted near the opening of the core insertion groove to press the magnetic thin plate onto the inner surface of the core insertion groove.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of the magnetic head according to the present invention, in which numeral 5 denotes a 7morphous magnetic thin plate that is a magnetic bump, 6 a gap formed approximately at the center of this magnetic thin plate 5, and 7 8 is a bump holder made of ceramic, non-magnetic ferrite or non-magnetic metal, and 8 is this core holder 7.
9 is a wedge made of ceramics, high melting point glass, etc. and press-fitted into the bump insertion groove 8; 10 is a low melting point glass to which the magnetic thin plate 5 is fixed; 11 is a winding. The wire groove 12 is a coil.

Note that as amorphous magnetic materials, for example, those having the following compositional formula are known.

(C070,5F e4.6S its BIO)99
．． 5 (WC) o, 5 (, Ni7a S i to B
12 L17 (WC)a(CO70,5Fe4,5
stl, BIG )99.9 (Cr20x)o Next, a method for manufacturing a magnetic head having the above structure will be explained based on the process diagrams in FIGS.

First, a winding groove 11 is formed in one of a pair of core holder block bodies (hereinafter abbreviated as block bodies) 13, which are the raw materials of the core holder, and a plurality of cores are inserted into corresponding positions on both sides. After forming the grooves 8, the abutting surfaces 13a of the pair of block bodies 13 subjected to such processing are polished (FIG. 2(A)). Here, when forming the knob insertion grooves 8, as shown in the partially enlarged view in FIG. 2(2), a tapered surface 8a is formed at the opening of each knob insertion groove 8,
The slope of a is made to match the slope of wedge 9, which will be described later.

Next, the abutting surfaces 13a of the pair of block bodies 13 thus processed are abutted against each other, and both are fixed with glass or the like (see ω in the same figure).

After that, the 7-morph bus magnetic thin plates 5 are inserted into the plurality of core insertion grooves 8 formed in the block body 13 fixed in this way, and the wedges 9 are further press-fitted, and then the low melting point glass rod 14 is heated and melted. A glass 10 is obtained, and the magnetic thin plate 5 is fixed by this glass 10 (see (C) in the same figure).
)). At this time, a winding hole 15 is provided in the magnetic thin plate 5, and when the wire is inserted, the winding hole 15 and the winding groove 11 of the block body 130 are aligned to be inserted. In addition, since the opening of the core insertion groove 8 is provided with a tapered surface 8a as shown in FIG. 2(G), the magnetic thin plate 5 can be easily inserted. Since the wedge 9 is press-fitted, the upper end of the magnetic thin plate 5 is fixed to the inner surface of the core insertion groove 8 by pressure.

Then, the assembled body of the block body 13 with the magnetic thin plate 5 fixed in the knob insertion groove 8 in the above step is cut at approximately the center where the gap is formed, and each cut surface is polished (
Same figure ■)).

Next, a pair of block bodies 13 whose cut surfaces have been polished in this way are
are butted against each other and fixed together with glass or the like to form a gap 6 of a predetermined size, and then the block body 13 is cut into pieces along the line A-A' to form a plurality of core holders including the gap 6. form (Figure (G)). At this time, since the block body 130 is divided into sections so that the cut surface along the line A-A' is inclined with respect to both end surfaces of the block body 130, the gap 6 forms a predetermined angle with respect to the direction perpendicular to the cut surface.

After dividing and cutting into a plurality of knob holders 7 in the above process,
The surface in sliding contact with the magnetic tape, that is, the side where the wedge 9 is press-fitted, is polished into a predetermined shape using a polishing tape (see ``■'' in the same figure).

At this time, the upper end of the magnetic thin plate 5 is crimped and fixed to the inner surface of the knob insertion groove 8 by the wedge 9 as described above, and polishing is performed in this state, so that the magnetic thin plate 5 and the glass 10 are Even if the adhesion is not good, the upper end of the magnetic thin plate 5 receives less vibration during polishing. Therefore, there is no risk that the poor adhesion between the magnetic thin plate 5 and the glass 10 will further progress, or that the finish of the upper end of the magnetic thin plate 5 will become uneven.

After polishing is completed, the coil 12 is wound around the winding m11 to complete the magnetic head (FIG. IG)). Here, as described above, the gap 6 is α0(
α≠0), thus obtaining the desired Fujimas angle.

In addition, in the above embodiment, the magnetic thin plate 5 in the tip insertion groove 8 is
Although glass 10 is used for fixing, synthetic resin such as epoxy resin or adhesive may be used instead of glass.

〔Effect of the invention〕

As explained above, according to the present invention, since the upper end of the magnetic thin plate is fixed by pressure with a wedge, the magnetic thin plate does not get used to wobbling during polishing. A stable magnetic head can be obtained.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the magnetic head according to the present invention, FIGS. 2 (2) to (G) are process diagrams showing the manufacturing method of the above embodiment, and FIG. 3 is a polishing of a conventional magnetic head. FIG. 5... Magnetic thin plate, 7... Core holder,
8... Knob insertion groove, 9... Wedge, 1
0...Glass. Sai 1 Figure Sai 2 (A) Sai 2112T IB)

Claims (1)

[Claims] In a magnetic head that includes a knob holder having a core insertion groove and a magnetic thin plate inserted into the core insertion groove, the magnetic thin plate is press-fitted near the opening of the core insertion groove so that the magnetic thin plate is inserted into the core insertion groove. A magnetic head characterized by having a wedge attached to the side surface.